School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China.
School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, PR China.
Carbohydr Polym. 2023 Jun 1;309:120672. doi: 10.1016/j.carbpol.2023.120672. Epub 2023 Feb 9.
A thermal/pH-sensitive interpenetrating network (IPN) hydrogel was prepared facilely from starch and poly(α-l-lysine) through amino-anhydride and azide-alkyne double-click reactions in one pot. The synthesized polymers and hydrogels were systematically characterized using different analytical techniques such as Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and rheometer. The preparation conditions of the IPN hydrogel were optimized via one-factor experiments. Experimental results indicated the IPN hydrogel possessed pH and temperature sensitivity. Effect of different parameters (pH, contact time, adsorbent dosage, initial concentration, ionic strength, and temperature) on adsorption behavior were investigated in monocomponent system with cationic methylene blue (MB) and anionic Eosin Y (EY) as model pollutants. The results indicated that the adsorption process of the IPN hydrogel for MB and EY followed pseudo-second-order kinetics. The adsorption data for MB and EY fitted well with the Langmuir isotherm model, indicating monolayer chemisorption. The good adsorption performance was due to various active functional groups (-COOH, -OH, -NH, etc.) in the IPN hydrogel. The strategy described here opens up a new way for preparing IPN hydrogel. The as-prepared hydrogel exhibits potential application and bright prospects as an adsorbent in wastewater treatment.
一种通过氨基-酸酐和叠氮-炔烃点击反应一锅法制备的淀粉和聚（α-赖氨酸）的热/pH 敏感互穿网络（IPN）水凝胶。通过傅里叶变换红外光谱（FTIR）、核磁共振（NMR）、扫描电子显微镜（SEM）、X 射线衍射（XRD）、X 射线光电子能谱（XPS）和流变仪等不同分析技术对合成聚合物和水凝胶进行了系统的表征。通过单因素实验优化了 IPN 水凝胶的制备条件。实验结果表明，IPN 水凝胶具有 pH 和温度敏感性。在以阳离子亚甲蓝（MB）和阴离子曙红 Y（EY）为模型污染物的单组分体系中，考察了不同参数（pH、接触时间、吸附剂用量、初始浓度、离子强度和温度）对吸附行为的影响。结果表明，IPN 水凝胶对 MB 和 EY 的吸附过程符合准二级动力学。MB 和 EY 的吸附数据与 Langmuir 等温吸附模型拟合较好，表明为单层化学吸附。良好的吸附性能归因于 IPN 水凝胶中各种活性官能团（-COOH、-OH、-NH 等）。这里描述的策略为制备 IPN 水凝胶开辟了一条新途径。所制备的水凝胶作为废水处理中的吸附剂具有潜在的应用和广阔的前景。
